Konica Minolta Darwin VDP Software - Manual (Page 52)

a. Click the P1 box.
b. In the parameter list (P1), select the source information for the
value. In this case, select Field.
c. In the list that appears next to the P1 list box, select a field (the
list of fields comes from your data source). In this example, select
Birth date.
The function calculates the person's age by subtracting the value
of the Birth date field from the current date.
9. On the Tools panel, click Accept .
Your function is saved on the Functions tab, on the Tools panel.
10. From the File menu, select Save.
Next:
Use the function as input for a rule, or apply the function directly to a
box in the InDesign CS3 document.
44 Chapter 6—Working with functions